If that's the case, why do you even bother joining such campaigns?
You chose to join the campaign, knowing that you will be "paid" with the worthless tokens.
My question is, why do you think this bounty managers are accepting more and more people to the point that there are almost none left from the pool to be divided among the participants?
I'm pretty sure it isn't the bounty manager's decision, but the people who run the project. The bounty managers are mostly just paid to follow the requirements and demands of the project teams.
And why do you tthink these people are giving away an amount that is almost impossible to trade with in the next years? Does it add value to a coin when there are a lot of holders? Lots of questions in my head I hope you can answer.
You really don't expect a token to be worth something early on, regardless if the coin/token is actually legitimate or not. Remember, even bitcoin was worthless in it's early days. Though I'm not saying that these airdropped coins/tokens will have value in the future. Chances are, most will not.
Does it add value to a coin when there are a lot of holders? Lots of questions in my head I hope you can answer.
Well, airdropping certain coins/tokens does give it a lot more publicity, so it probably adds "value" to it. Though most of the coins/tokens being airdropped is going to end up being a useless dead coin anyway, so why bother.